Manual M lens vs 24-90 on video shooting

[leica1215]

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I haven't tried the manual lens on SL yet, for video filming is it the 24-90 lens better in terms of auto focusing? Let's say when shoot video people moving towards you or from one distance to another how you manage to get clear good focusing film?

 

I'm new to filming, please advise.

Thanks

 

 

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[steveBK]

I have dabbled in video a couple years in m4/3 and Sony A7* systems, and now playing around on a rental SL a little bit.

 

 

Are you going to be handheld or with gimbal / tripod / monopod?

Generally, OIS/IBIS is more of an issue for handheld shooting than MF vs AF.

That is - very few people can hand-hold video without quite a lot of jittering. 

Some is correctable in post-production, but this does produce artifacts and introduce a crop.

You can shoot wide (28mm equivalent or so, which with the APS crop on SL means something like an 18-20mm lens) to minimize the effect..

 

With regards to AF vs MF, this is to some degree a decision of taste and what type of shooting you are doing.

With MF on tripod you can pull your own focus.. of course this sometimes requires extra hands, gizmos, and predictable subject motion.

There are still no systems with good enough AF to truly do smooth tracking in video.

With MF handheld you are generally stuck with a fixed zone of focus.

So you are weighing "OK but hunt-y / slightly unpredictable AF" vs "fixed, but predictable MF".

[ramarren]

Since focusing induces motion into the captured image stream when doing motion capture, focusing is a part of the planned movement of subject and camera. Only cheap and cheesy consumer movie/video making uses autofocusing, IMO ... certainly no real cinematographer ever would. 

 

I've not done very much motion capture so far with my SL, but the little I have has all been done with wide to normal R lenses. When I tested them against doing the same shots with the SL24-90, I couldn't stand the way AF looked: the scene didn't progress the way I expected or wanted because I wasn't sufficiently in control of the focus zone or focusing action. 

 

There's a reason that dedicated cine lenses are always manual focus, and have stepless aperture control.